Ok, about hardening pharaoh's heart. So let's say it was Pharaoh's decision not to let Jews go. God did not directly make Pharaoh to make that decision. But he rather influenced his thoughts, so God can display his power and show them he was the only God.
Exodus 7:3-4
3 But I will harden Pharaoh's heart, and though I multiply my miraculous signs and wonders in Egypt, 4 he will not listen to you. Then I will lay my hand on Egypt and with mighty acts of judgment I will bring out my divisions, my people the Israelites.
Reading the verse 4, God knew Pharaoh would not listen to him. Doesn't this mean Pharaoh's life was predestined? So when someone's life is predestined, how can you say he has a free will?
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